Stop-Start Battery went bad - Page 7 - 2017+ Chrysler Pacifica Minivan Forums
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post #61 of 68 (permalink) Old 04-22-2019, 08:32 AM
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Originally Posted by jerry17 View Post
Yes, but I wonder how much power it would need and if the alternator could deliver it, given @TomB985 's comment about relative sizes.

The Pacifica, like most modern cars, consumes a LOT of power even before the headlights come on, (and this is a possible design deficit) it may not have a strong enough alternator to cope with multiple slow, short trips, and the ESS charging load probably exacerbates that situation.

At least ESS shuts itself off when it detects a low battery. With almost instant starting thanks to fuel injection, we lost the clue of slow cranking that used to warn us when a main battery struggles.

I don't have ESS, but I can see that keeping lights, fans, radios, etc. going when the engine is off is not a trivial load. I also suspect that ESS batteries have a much deeper charge/discharge history than the main battery. And perhaps those deep discharges shorten the life. I know that when my van would not start with a flat battery (the only warning was the infotainment screen was dead all day -- the van started fine on several trips, and then would not even operate the sliding door the next morning) based on comments here I insisted on new battery. According to posts in the forums, a discharge that deep drastically cuts the life of the battery. I don't know if the ESS cuts out fast enough to prevent damage to the battery.

There is a constant stream of early battery replacement posts in these threads (including mine at about 20 months, and comments that Chrysler is not alone in this trend. Maybe those who monitor other brands can verify this.
As well, lead acid batteries have a maximum charge rate. You can only stuff electricity into them at a certain rate, and that rate tapers off quite sharply above 80% charge. My point being, it takes a fixed amount of time to charge up a battery regardless of how much power is available from the alternator. This may contribute to ESS not working well for folks that make lots of short trips. If the ESS battery needs to be at a high state of charge, you canít get it there during a 10 minute drive, for example.
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post #62 of 68 (permalink) Old 04-23-2019, 05:12 PM
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I remember being frustrated with the system in my van during cold weather, as it did not like to engage much of the time he felt that it should. But one thing is warmed up, it got a lot better, so I just chalked up is a characteristic of the system. As of one week ago I no longer on the van, I can't really make any further comparisons as things warm-up.

My relationship my Pacifica was much of a love-hate relationship; when things are working it was the best van I've ever driven. Two failures that would have left me stranded soured my opinion on the van, and regular occurrences of minor glitches got to be little frustrating over the years around. I look at the ESS system as a source of some of those glitches. If Chrysler can get these bugs ironed out, they will have hit it out of the park with the design. It's a shame it takes them so much work when other manufacturers seem to get things right the first time around.

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post #63 of 68 (permalink) Old Yesterday, 11:14 AM
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I brought my 2018 Gas Pacifica to the dealer yesterday. They had to charge, or attempt to charge the ESS battery then test it to determine if it was bad. my guess is a load test and it failed. BUT they don't have MOPAR batteries. So the tech said he had to try to get management to approve a different non OEM battery for replacement. It's a bit of a PITA but I do understand.



Now I would like data about how many of these batteries failed, what the actual cause of failure was. Was it poor manufacturing or poor design e.g. too small a capacity battery, or insufficient charger etc. There is also a recall about a bad ground ... could these be related?


PS the bad ground was a cable manufacturer having some insulating material/chemical on the connector.

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post #64 of 68 (permalink) Old Yesterday, 03:38 PM
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The bad ground connector might be a very minor bit-player in the near-complete failure of the stop/start system but based upon my experience with the connector recall and my own Pacifica still not operating the stop/start properly after the recall. . . Nah, it won't help to have that connector cleaned up. Still should have it done if your vehicle falls under that recall list (not sure mine did but the dealer did it anyway). Because if the connector does totally fail, you can have some serious issues related to the power steering.

But the only solution to the ESS and stop/start system is to get a couple really talented engineers together and tell them there is no stupid solution except the one you throw away because "they" won't like it upstairs. Then test, test, test, test the recommended fix. Then test again. Did I mention test it before it's fielded?
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post #65 of 68 (permalink) Old Yesterday, 08:14 PM Thread Starter
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Originally Posted by K&BsNu2108Pacifica View Post
The bad ground connector might be a very minor bit-player in the near-complete failure of the stop/start system but based upon my experience with the connector recall and my own Pacifica still not operating the stop/start properly after the recall. . . Nah, it won't help to have that connector cleaned up. Still should have it done if your vehicle falls under that recall list (not sure mine did but the dealer did it anyway). Because if the connector does totally fail, you can have some serious issues related to the power steering.

But the only solution to the ESS and stop/start system is to get a couple really talented engineers together and tell them there is no stupid solution except the one you throw away because "they" won't like it upstairs. Then test, test, test, test the recommended fix. Then test again. Did I mention test it before it's fielded?
Totally agree. We have ended paying for a feature that does not work.

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post #66 of 68 (permalink) Old Yesterday, 08:16 PM Thread Starter
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Originally Posted by Professor View Post
I brought my 2018 Gas Pacifica to the dealer yesterday. They had to charge, or attempt to charge the ESS battery then test it to determine if it was bad. my guess is a load test and it failed. BUT they don't have MOPAR batteries. So the tech said he had to try to get management to approve a different non OEM battery for replacement. It's a bit of a PITA but I do understand.



Now I would like data about how many of these batteries failed, what the actual cause of failure was. Was it poor manufacturing or poor design e.g. too small a capacity battery, or insufficient charger etc. There is also a recall about a bad ground ... could these be related?


PS the bad ground was a cable manufacturer having some insulating material/chemical on the connector.
if they replace your battery for a different brand, please post it here. Would be good to track how the other brand battery holds.

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post #67 of 68 (permalink) Old Today, 08:34 AM
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Originally Posted by citanic View Post
Totally agree. We have ended paying for a feature that does not work.
Mine has worked fine for over a year. I just don't like it, but that's another thread.

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post #68 of 68 (permalink) Old Today, 10:16 AM Thread Starter
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Mine has worked fine for over a year. I just don't like it, but that's another thread.
Mine worked fine for around that long too. Now it's working any more.

It seems that all depends of how long are you daily trips. In my case they are less than 3 miles in the morning and 3 miles in the afternoon. No enough time to fully charge the battery. Also, it seems that when the battery works on that way for few months it gets bad, meaning that a long trip will not full charge it any more. In another words, the battery from Mopar sucks or in another words again, was not designed to work in those conditions. Many manufacturers have run into the same situation and have started to replace those batteries in their design by High Capacitor Batteries. But that's how far I have got in my "investigation". I do not know what High Capacitor Battery to use if I decide the high cost of these batteries and if our Van will work with them. Of course is useless to ask Mopar or @ChryslerCares . They simple put will not answer those questions neither admit any fault in this case. And yes, I already filed a complaint at NHTSA

https://www.nhtsa.gov/vehicle/2018/C...FWD#complaints

I hope that these complaints are heard at one point and a recall issued.

Note: I already replaced my two batteries less than a month ago and I'm not planning to go through the same process again and again. So I'm not planning to go back to the dealer unless Mopar issue a recall that explains clear how to handle this specific issue. I refuse to serve then as guinea pig. The only downside of this issue is that I'm wasting more gasoline than what I was supposed and the risk of that battery totally failing on me.

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Last edited by citanic; Today at 10:22 AM.
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